CN114450524A - Air conditioner ventilation system - Google Patents

Air conditioner ventilation system Download PDF

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Publication number
CN114450524A
CN114450524A CN202080068477.7A CN202080068477A CN114450524A CN 114450524 A CN114450524 A CN 114450524A CN 202080068477 A CN202080068477 A CN 202080068477A CN 114450524 A CN114450524 A CN 114450524A
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CN
China
Prior art keywords
air
air volume
fan
equivalent value
exhaust
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Granted
Application number
CN202080068477.7A
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Chinese (zh)
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CN114450524B (en
Inventor
平井浩介
山本昌由
酒井岳人
藤本徹
松木义孝
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Daikin Industries Ltd
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Daikin Industries Ltd
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Publication of CN114450524A publication Critical patent/CN114450524A/en
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Publication of CN114450524B publication Critical patent/CN114450524B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2614—HVAC, heating, ventillation, climate control

Abstract

An air conditioning ventilation system (S) is provided with: an air conditioning device (20) having a heat exchanger (22) that generates conditioned air by heat exchange with a refrigerant; a ventilation device (30) which is communicably connected to the air conditioning device (A) and has an air supply fan (34) and/or an exhaust fan (35); air volume detection units (37, 38) for detecting an air volume equivalent value of the ventilator (30); and a control unit (36). The control unit (36) stops the operation of the air conditioner (A) when determining that the air volume equivalent value acquired from the air volume detection units (37, 38) is equal to or less than a first predetermined value.

Description

Air conditioner ventilation system
Technical Field
The present disclosure relates to an air conditioning ventilation system. More specifically, the present invention relates to an air conditioning ventilation system including an air conditioner and a ventilator.
Background
In a relatively large-scale building such as an office building or a hotel, an air conditioner that generates cold air or hot air and a ventilator that supplies outside air to the room and exhausts the room are commonly used in combination.
If the refrigerant leaks from the air conditioner into the room, a trouble such as oxygen deficiency may occur. In order to suppress the occurrence of such a problem, it has been conventionally proposed to operate a ventilation device when leakage of refrigerant is detected (see, for example, patent document 1).
In the air conditioning ventilation system described in patent document 1, when leakage of the refrigerant is detected in a state where the air conditioner and the ventilation device are communicatively connected, the control device of the air conditioner instructs the control device of the ventilation device to perform operation of the ventilation device. In addition, when the air volume of the ventilator is insufficient due to a failure of the ventilator or the like, the control device of the air conditioner increases the air volume of the air conditioner. This suppresses accumulation of the leaked refrigerant in the air-conditioned space and insufficient discharge of the refrigerant.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-
Disclosure of Invention
Technical problem to be solved by the invention
Patent document 1 describes operations of the ventilator and the air conditioner in the case where the refrigerant actually leaks, but does not disclose how to secure the air volume of the ventilator as a safety device in advance to prepare for the refrigerant leakage.
The present disclosure aims to provide an air conditioning ventilation system capable of suppressing an insufficient air volume of a ventilation device when a refrigerant leaks.
Technical scheme for solving technical problem
Air conditioning ventilation system of the present disclosure
(1) The disclosed device is provided with: an air conditioner having a heat exchanger that generates conditioned air by heat exchange with a refrigerant; a ventilation device which is communicably connected to the air conditioning device and has an air supply fan and/or an air exhaust fan; an air volume detection unit that detects an air volume equivalent value of the ventilator; and a control part for controlling the operation of the motor,
the control unit stops the operation of the air conditioner when determining that the air volume equivalent value acquired from the air volume detection unit is equal to or less than a first predetermined value.
In the air conditioning and ventilating system of the present disclosure, the control unit sets the operation of the air conditioner to a stopped state if it is determined that the air volume equivalent value of the ventilator is equal to or less than the first predetermined value. Thus, even if the refrigerant leaks, the ventilation device can be prevented from having insufficient air volume. In the present specification, the phrase "bringing the operation into a stopped state" is intended to include both stopping the device in the operating state and maintaining the device in the stopped state as it is.
(2) In the air conditioning ventilation system according to (1), the ventilation device may include an air supply fan and an air discharge fan,
the air volume detection unit includes: an air supply volume detection unit that detects an air supply volume equivalent value of the air supply fan; an exhaust air volume detection part for detecting the exhaust air volume equivalent value of the exhaust fan,
the control unit performs air volume constant control for adjusting the rotation speeds of the intake air fan and the exhaust air fan so that the intake air volume equivalent value and the exhaust air volume equivalent value approach respective target air volumes, and stops the operation of the air conditioner when it is determined that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is equal to or less than the first predetermined value during the air volume constant control. In a ventilator having an intake fan and an exhaust fan for performing constant air volume control, the operation of an air conditioner is stopped when at least one of an intake air volume equivalent value and an exhaust air volume equivalent value is equal to or less than a first predetermined value, whereby the shortage of air volume in the ventilator can be suppressed even when refrigerant leaks. In addition, the serviceman or the user can be made aware of the failure of the ventilator at an early stage and can take a countermeasure for eliminating the failure.
(3) In the air conditioning and ventilating system according to the above (2), it is preferable that the air conditioning and ventilating system further includes an alarm unit that generates an alarm based on the detected air volume equivalent value,
the control unit causes the alarm unit to generate an alarm when it is determined that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is greater than the first predetermined value and is equal to or less than a second predetermined value that is greater than the first predetermined value. This makes it possible to make a serviceman or a user recognize a failure of the ventilator before the forced stop of the air conditioner during operation and take a measure to eliminate the failure.
(4) In the air-conditioning ventilation system according to (1) above, it is preferable that the air-conditioning ventilation system further includes: and a remote controller for operating the operation of the air conditioner, wherein the control unit prohibits the operation by the remote controller if it is determined that the air volume equivalent value acquired from the air volume detection unit is equal to or less than a first predetermined value. This prevents the user from operating the air conditioner when the ventilation apparatus is defective and maintenance is required, for example, and as a result, the user can more reliably urge maintenance for eliminating the defect of the ventilation apparatus.
(5) In the air conditioning and ventilating system according to the above (2) or (3), it is preferable that the air conditioning and ventilating system further includes a remote controller for operating an operation of the air conditioner,
the control unit prohibits the operation of the remote controller when determining that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is equal to or less than a first predetermined value. This can prevent the user from operating the air conditioner when the ventilation device is defective and maintenance is required, for example, and as a result, maintenance for eliminating the defect of the ventilation device can be more reliably promoted.
(6) In the air-conditioning ventilation system according to the above (3) or (5), it is preferable that the air-conditioning ventilation system further includes an auxiliary fan for supplementing a ventilation air volume,
the control unit operates the auxiliary fan when determining that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is greater than a first predetermined value and is equal to or less than a second predetermined value that is greater than the first predetermined value. By operating the auxiliary fan, the reduced air volume of the ventilator can be supplemented.
(7) In the air-conditioning ventilation system according to the above (6), it is preferable that the control unit stops the operation of the air-conditioning apparatus when determining that at least one of a sum of the intake air volume equivalent value and the intake air volume equivalent value of the auxiliary fan and a sum of the exhaust air volume equivalent value and the exhaust air volume equivalent value of the auxiliary fan is equal to or less than the first predetermined value. When at least one of the total of the intake air volume equivalent values and the total of the exhaust air volume equivalent values cannot ensure the first predetermined value even with the air volume assist by the assist fan, the operation of the air conditioner is stopped, and the air volume shortage of the ventilator can be suppressed even if the refrigerant leaks. In addition, it is possible to prompt the serviceman or the user to know that the normal ventilation air volume is not ensured and to prompt the trouble elimination of the ventilation device.
(8) In the air conditioning and ventilating system according to the above (2), (3), (5), (6), or (7), the supply air volume of the supply fan and the exhaust air volume of the exhaust fan may be determined based on the rotation speed and the power consumption of the supply fan and the rotation speed and the power consumption of the exhaust fan, respectively. Whether or not the air volume is equal to or less than the first predetermined value can be determined using the air volume determined based on the rotation speed and the power consumption amount of the fan.
Drawings
Fig. 1 is an explanatory view of a refrigerant piping system and an air system in an embodiment of an air conditioning ventilation system according to the present disclosure.
Fig. 2 is a block diagram showing the configuration of each control unit of the centralized controller, the outdoor unit, the indoor unit, the ventilation device, and the remote controller.
Fig. 3 is a perspective view illustrating the structure of the total heat exchanger of the ventilator.
Fig. 4 is a flowchart showing an example of the operation of the ventilation apparatus.
Fig. 5 is a flowchart showing another example of the operation of the ventilator.
Fig. 6 is an explanatory diagram of a refrigerant piping system and an air system in a modification of the air conditioning and ventilation system shown in fig. 1.
Fig. 7 is a block diagram showing the configuration of the centralized controller, the outdoor unit, the indoor unit, the ventilation device, the remote controller, and the respective control units of the auxiliary fan in the air conditioning and ventilation system shown in fig. 6.
Detailed Description
Hereinafter, the air conditioning ventilation system of the present disclosure will be described in detail with reference to the drawings. It should be noted that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and range equivalent to the claims.
[ integral Structure of Ventilation System for air conditioner ]
Fig. 1 is an explanatory diagram illustrating a refrigerant piping system and an air system of an air conditioning and ventilation system S according to an embodiment of the present disclosure. The air conditioning and ventilation system S includes a refrigerant piping type distributed air conditioning device, and performs cooling and heating of the room R by performing a vapor compression refrigeration cycle operation, and performs ventilation of the room R by a ventilation device described later.
The type of the room R, which is an air-conditioned space to which the air-conditioning ventilation system S is applied, is not particularly limited in the present disclosure, and includes all spaces or places where cooling and/or heating and ventilation are performed, such as offices, hotels, theaters, and shops. The air conditioning/ventilation system S includes an outdoor (heat source) unit 10 installed outside an indoor unit R, an indoor unit 20 serving as an air conditioning device installed in the indoor unit R, a ventilation device 30, and an integrated controller 40. The outdoor unit 10 and the indoor units 20 constitute an air conditioning apparatus a. The outdoor unit 10 and the indoor unit 20 are connected by a liquid refrigerant connection pipe 11 and a gas refrigerant connection pipe 12. The ventilator 30 is connected to the room R through an air Supply (SA) duct 31 and an air Return (RA) duct 32. In the room R, the indoor unit 20 may be provided on the floor surface, may be disposed near the ceiling, or may be disposed inside the ceiling. In fig. 1, only 2 indoor units 20 are illustrated, but the number of indoor units 20 may be 1 or 3 or more. In the embodiment shown in fig. 1, 1 outdoor unit 10 is connected to the indoor unit 20 of the indoor R that is one space to be air-conditioned, but 1 outdoor unit 10 may be connected to a plurality of indoor units disposed in a plurality of indoor rs. In this case, a ventilator is disposed in each of the rooms.
As shown in fig. 2, the centralized controller 40 includes a CPU401, a storage unit 402, and a transmission/reception unit 403. The centralized controller 40 communicates with a control unit, which will be described later, of the outdoor unit 10, the indoor unit 20, and the ventilation device 30 via the transmission/reception unit 403, and controls the operations of the respective devices.
The outdoor unit 10 and the indoor units 20 can perform air conditioning of the indoor space R by performing a known refrigeration cycle operation. Note that a detailed description of known refrigerant circuits in the respective interiors of the outdoor unit 10 and the indoor units 20 is omitted, and only portions related to the present disclosure will be described below.
The outdoor unit 10 includes a compressor 13, a four-way switching valve 14, an outdoor heat exchanger 15, an outdoor expansion valve 16, a liquid shutoff valve 17, a gas shutoff valve 18, an outdoor fan 19, and a controller 41. In the air conditioning and ventilating system S according to the present embodiment, the outdoor unit 10, the 2 indoor units 20, and the ventilator 30 are communicably connected.
The compressor 13 is a hermetic compressor driven by a motor (not shown) for the compressor, and sucks a gas refrigerant from a suction passage 13a on the suction side of the compressor 13.
The four-way switching valve 14 is a mechanism for switching the direction of the flow of the refrigerant. In the cooling operation, as shown by the solid line in fig. 1, the four-way switching valve 14 connects the refrigerant pipe 13b on the discharge side of the compressor 13 to one end of the outdoor heat exchanger 15, and connects the suction flow path 13a on the suction side of the compressor 13 to the gas shutoff valve 18. Thus, the outdoor heat exchanger 15 functions as a condenser of the refrigerant compressed by the compressor 13, and an indoor heat exchanger described later functions as an evaporator of the refrigerant condensed in the outdoor heat exchanger 15.
In the heating operation, as shown by the broken line in fig. 1, the four-way switching valve 14 connects the refrigerant pipe 13b on the discharge side of the compressor 13 to the gas shutoff valve 18, and connects the suction flow path 13a to one end of the outdoor heat exchanger 15. Thus, the indoor heat exchanger functions as a condenser of the refrigerant compressed by the compressor 13, and the outdoor heat exchanger 15 functions as an evaporator of the refrigerant cooled in the indoor heat exchanger.
The outdoor fan 19 introduces outside air into the outdoor unit 10, and discharges the outside air, which has exchanged heat with the refrigerant flowing through the outdoor heat exchanger 15, to the outside.
As shown in fig. 2, the control unit 41 includes a CPU411, a storage unit 412, and a transmission/reception unit 413. The control unit 41 is communicably connected to the centralized controller 40 via the transmission/reception unit 413, and controls the operation of the compressor 13 and the like.
The indoor unit 20 is connected to the outdoor unit 10 via refrigerant connection pipes 11 and 12, respectively. The 2 indoor units 20 shown in fig. 1 are all of the same external shape and internal configuration. Each indoor unit 20 includes an indoor expansion valve 21, an indoor heat exchanger 22, an indoor fan 23, a refrigerant sensor 24, and a control unit 25.
The indoor fan 23 sucks air in the indoor room R into the indoor unit 20, and supplies conditioned air, which has exchanged heat with the refrigerant flowing through the indoor heat exchanger 22, to the indoor room R.
The refrigerant sensor 24 detects the concentration of the refrigerant leaking from the refrigerant pipe or the like. The refrigerant sensor 24 continuously or intermittently outputs an electric signal corresponding to the detection value to the control unit 25. The electric signal changes the voltage in accordance with the concentration of the refrigerant detected by the refrigerant sensor 24.
The position of the refrigerant sensor 24 is not particularly limited as long as it is a position where leakage of refrigerant can be detected, but it is preferably disposed in the vicinity of a position where leakage of refrigerant is likely to occur, such as a joint between refrigerant pipes, a bent portion of 90 degrees or more of refrigerant pipes, a portion where the pipe thickness is thin, or the like. The refrigerant sensor 24 may be disposed in the indoor unit 20, may be mounted on a remote controller described later for setting room temperature, air volume, and the like, or may be disposed in an appropriate place such as an indoor wall surface.
As shown in fig. 2, the control unit 25 includes a CPU251, a storage unit 252, and a transmission/reception unit 253. The control unit 25 is communicably connected to the centralized controller 40 via the transmission/reception unit 253. The control unit 25 controls the operation of the indoor fan 23 and the like of the indoor unit 20. The control unit 25 receives an electric signal from the refrigerant sensor 24 via the transceiver 253.
The ventilator 30 exchanges heat with fresh outside air OA to supply the air to the room R as supply air SA, and discharges return air RA from the room R to the outside. The ventilator 30 includes a total heat exchanger 33, an intake fan 34, an exhaust fan 35, a control unit 36, an intake air volume detection unit 37, and an exhaust air volume detection unit 38.
The total enthalpy heat exchanger 33 of the present embodiment is an orthogonal total enthalpy heat exchanger configured such that the outdoor air OA from the outside and the return air RA from the inside are almost orthogonal to each other. As shown in fig. 3, the total enthalpy heat exchanger 33 is a laminate in which flat plate-shaped partition plates 33a having heat conductivity and moisture permeability and corrugated partition plates 33b are laminated in this order in the vertical direction in fig. 3. The partition plate 33b has a cross section in which substantially triangular cross sections are arranged in the lateral direction when viewed in the air flow direction (the direction indicated by the hollow arrow or the black arrow in fig. 3), and the flow path height is maintained by the triangular height. The partition plates 33b are stacked with an angle of 90 degrees changed every block across the partition plate 33a so that every other block appears in a wavy cross section in the up-down direction (up-down direction in fig. 3) at a certain side face. Thus, an air supply-side passage (see the open arrows in fig. 3) and an air discharge-side passage (see the black arrows in fig. 3) are formed through the partition plate 33a having heat conductivity and moisture permeability, and sensible heat and latent heat are exchanged through the partition plate 33 a. The ventilator 30 of the present embodiment is a first ventilator in which air is supplied by a fan and discharged by the fan. Further, as the ventilator of the present disclosure, a second ventilator in which air supply is performed by a fan and exhaust is natural exhaust, or a third ventilator in which exhaust is performed by a fan and air supply is natural air supply may be used.
As shown in fig. 2, the control unit 36 includes a CPU361, a storage unit 362, and a transmission/reception unit 363. The control unit 36 is communicably connected to the integrated controller 40, the supply air volume detection unit 37, and the exhaust air volume detection unit 38 via the transmission/reception unit 363. The supply air volume detection unit 37 detects an air volume equivalent value of the supply air fan 34. The exhaust air volume detection unit 38 detects an air volume equivalent value of the exhaust fan 35. The supply air volume detection unit 37 and the exhaust air volume detection unit 38 may be air volume sensors that detect the air volumes of the supply fan 34 and the exhaust fan 25. When the air volume sensor is used, the air volume equivalent value may be, for example, a voltage value corresponding to the air volume.
In the ventilator 30 of the present embodiment, the control unit 36 performs constant air volume control for adjusting the rotation speeds of the intake fan 34 and the exhaust fan 35 so that the intake air volume and the exhaust air volume approach the respective target values. The storage unit 362 stores the target intake air volume, which is the target intake air volume, and the target exhaust air volume, which is the target exhaust air volume. When the air volume sensors are used as the supply air volume detection unit 37 and the exhaust air volume detection unit 38, the supply air target air volume and the exhaust air target air volume stored in the storage unit 362 are voltage values corresponding to the respective air volumes. The control unit 36 refers to the target intake air volume and the target exhaust air volume stored in the storage unit 362 based on the intake air volume equivalent value and the exhaust air volume equivalent value detected by the intake air volume detection unit 37 and the exhaust air volume detection unit 38, and performs air volume constant control. The storage unit 362 stores the rotation speeds of the air supply fan 34 and the air discharge fan 35 at the start of operation of the ventilation device 30. The rotation speed at the start of the first operation may be a rotation speed determined at the time of the test operation, or may be a rotation speed set in advance. The rotation speed at the start of the second and subsequent operations may be a preset rotation speed, or a final rotation speed at the previous operation may be stored.
In the present embodiment, a remote controller 50 is disposed in the room R. The remote controller 50 includes a display unit 51, a control unit 52, and an input unit 53. The display unit 51 displays information such as an operation mode and a room temperature of the indoor unit 20, and also functions as an alarm unit for generating (displaying) an alarm and notifying an alarm in advance, which will be described later. As shown in fig. 2, the control unit 52 includes a CPU521, a storage unit 522, and a transmission/reception unit 523. The controller 52 is communicably connected to the controller 25 of the 2 indoor units 20, the controller 36 of the ventilator 30, and the centralized controller 40 via the transceiver 523, and controls the operation of the remote controller 50. The user can perform temperature adjustment, start and stop of the operation of the apparatus, and the like by operating the input unit 53.
The centralized controller 40 and the control units 25, 36, 41, and 52 include a Computer (CPU), and the computer executes software (computer program) to realize a desired control function. The software is stored in the centralized controller 40 and the storage units of the respective control units 25, 36, 41, and 52. The centralized controller 40 and the control units 25, 36, 41, and 52 are connected to each other by communication lines, and can coordinate control and share information.
[ basic operation of air-conditioning apparatus A ]
The air conditioner a having the above-described configuration performs a cooling operation or a heating operation as follows.
During the cooling operation, the four-way switching valve 14 is in the state shown by the solid line in fig. 1 as described above. In this state, the high-pressure gas refrigerant discharged from the compressor 13 is sent to the outdoor heat exchanger 15 functioning as a condenser via the four-way switching valve 14, and is cooled by heat exchange with the outside air supplied by the outdoor fan 19. The high-pressure refrigerant cooled and liquefied in the outdoor heat exchanger 15 is sent to each indoor unit 20 through the liquid-refrigerant connecting pipe 11. The refrigerant sent to each indoor unit 20 is decompressed by the indoor expansion valve 21 to become a low-pressure two-phase gas-liquid refrigerant, and is evaporated to become a low-pressure gas refrigerant by exchanging heat with the air in the room R in the indoor heat exchanger 22 functioning as an evaporator. The low-pressure gas refrigerant heated in the indoor heat exchanger 22 is sent to the outdoor unit 10 through the gas refrigerant connecting pipe 12, and is again sucked into the compressor 13 through the four-way switching valve 14.
On the other hand, during the heating operation, the four-way switching valve 14 is in the state shown by the broken line in fig. 1 as described above. In this state, the high-pressure gas refrigerant discharged from the compressor 13 is sent to each indoor unit 20 via the four-way switching valve 14 and the gas refrigerant connection pipe 12. The high-pressure gas refrigerant sent to each indoor unit 20 is sent to the indoor heat exchanger 22 functioning as a condenser, exchanges heat with the air in the room R, is cooled, passes through the indoor expansion valve 21, and is sent to the outdoor unit 10 through the liquid refrigerant connection pipe 11. The high-pressure refrigerant sent to the outdoor unit 10 is decompressed by the outdoor expansion valve 16 to become a low-pressure refrigerant in a gas-liquid two-phase state, and flows into the outdoor heat exchanger 15 functioning as an evaporator. The low-pressure gas-liquid two-phase refrigerant flowing into the outdoor heat exchanger 15 exchanges heat with the outside air supplied by the outdoor fan 19, is heated, and is evaporated into a low-pressure refrigerant. The low-pressure gas refrigerant that has exited the outdoor heat exchanger 15 is again sucked into the compressor 13 via the four-way switching valve 14.
[ basic action of the ventilation device 30 ]
The ventilator 30 is linked with the operation of the air conditioner a, and when the operation of the air conditioner a is started, the operation of the ventilator 30 is also started, and when the operation of the air conditioner a is stopped, the operation of the ventilator 30 is also stopped.
The control unit 36 performs the air volume constant control described above. Specifically, as shown in fig. 4, the following control is performed.
In step S1, the CPU361 of the control unit 36 of the ventilator 30 starts the operation of the ventilator 30 in conjunction with the operation of the air conditioner a.
In step S2, the CPU361 controls the rotation speeds of the air supply fan 34 and the air discharge fan 35 to a predetermined rotation speed stored in the storage unit 362.
In step S3, the supplied air volume detection unit 37 acquires an air volume equivalent value of the supplied air volume, and transmits the acquired air volume equivalent value to the control unit 36.
In step S4, the CPU361 of the control unit 36 compares the acquired air volume equivalent value of the supplied air volume with the target supplied air volume stored in the storage unit 362, and determines whether or not the air volume equivalent value is within a predetermined range from the target supplied air volume. When determining that the air volume equivalent value is within the predetermined range from the target supply air volume, the CPU361 returns to step S3.
On the other hand, when the CPU361 of the controller 36 determines in step S4 that the airflow equivalent value is not within the predetermined range from the target supply airflow rate, the process proceeds to step S5.
In step S5, when the air volume equivalent value is smaller than the target supply air volume and exceeds the predetermined range, the CPU361 of the control unit 36 increases the rotation speed of the supply air fan 34 more than the current rotation speed based on the current air volume equivalent value. When the air volume equivalent value is higher than the target supply air volume and exceeds the predetermined range, the CPU361 decreases the rotation speed of the supply air fan 34 from the current rotation speed based on the current air volume equivalent value.
In parallel with step 3, in step 6, the exhaust air volume detection unit 38 acquires an air volume equivalent value of the exhaust air volume, and transmits the acquired air volume equivalent value to the control unit 36.
In step S7, the CPU361 of the control unit 36 compares the acquired air volume equivalent value of the exhaust air volume with the target exhaust air volume stored in the storage unit 362, and determines whether or not the air volume equivalent value is within a predetermined range from the target exhaust air volume. When determining that the air volume equivalent value is within the predetermined range from the target exhaust air volume, the CPU361 returns to step S6.
On the other hand, in step S7, when determining that the air volume equivalent value is not within the predetermined range from the target exhaust air volume, the CPU361 of the control unit 36 advances the process to step S8.
In step S8, when the air volume equivalent value is lower than the target exhaust air volume and exceeds the predetermined range, the CPU361 of the control unit 36 increases the rotation speed of the exhaust fan 35 from the current rotation speed based on the current air volume equivalent value. When the air volume equivalent value is higher than the target exhaust air volume and exceeds the predetermined range, the CPU361 decreases the rotation speed of the exhaust fan 35 from the current rotation speed based on the current air volume equivalent value.
As described above, the ventilator 30 is linked with the air conditioner a, and when the operation of the air conditioner a is stopped, the operation of the ventilator 30 is also stopped. When receiving the information of the stop of the operation of the air conditioner a directly from the controller 25 of the indoor unit 20 or indirectly via the centralized controller 40, the CPU361 of the controller 36 stops the operation of the ventilation device 30 even during the processing of any one of the steps shown in fig. 4.
[ operation of ventilator 30 when the air volume decreases ]
Next, an operation when the air volume of the ventilator 30 of the air exchange system S is decreased will be described.
In the ventilator 30, as described above, when the intake air volume and the exhaust air volume decrease during the air volume constant control, the rotational speeds of the intake fan 34 and the exhaust fan 35 are increased to increase the intake air volume and the exhaust air volume. However, the rotation speeds of the intake fan 34 and the exhaust fan 35 of the ventilator 30 are respectively set to upper limits, and the air volume cannot be further increased after the rotation speed reaches the upper limit. Therefore, in the air conditioning and ventilation system S according to the present embodiment, when the rotation speeds of the intake fan 34 and the exhaust fan 35 reach the upper limit and the intake air volume and the exhaust air volume decrease to the predetermined lower limit or less, the following control is performed.
In the flowchart shown in fig. 5, steps S101 to S104 respectively represent the same processes as steps S1 to S4 of the flowchart shown in fig. 4. Step S108 and step S109 in fig. 5 also show the same steps as step S6 and step S7 in fig. 4, respectively. Therefore, for the sake of simplicity, the description of the same steps is omitted.
When the CPU361 of the control unit 36 determines in step S104 that the air volume equivalent value is not within the predetermined range from the target supply air volume, it determines in step S105 whether or not the air volume equivalent value is equal to or less than the lower limit supply air volume. When the CPU361 determines in step S105 that the air volume equivalent value is higher than the lower limit supply air volume, the process proceeds to step S106, and in step S106, the rotation speed of the supply air fan 34 is increased or decreased from the current rotation speed based on the current air volume equivalent value, as in step S5 of fig. 4, and then the process returns to step S103.
On the other hand, when the CPU361 of the control unit 36 determines in step S105 that the air volume equivalent value is equal to or less than the lower limit supply air volume, the process proceeds to step S107, and in step S107, a signal is transmitted to the centralized controller 40.
When the CPU361 of the control unit 36 determines in step S109 that the air volume equivalent value is not within the predetermined range from the target exhaust air volume, it determines in step S110 whether or not the air volume equivalent value is equal to or less than the lower limit exhaust air volume. When the CPU361 determines in step S110 that the air volume equivalent value is higher than the lower limit exhaust air volume, the process proceeds to step S111, and in step S111, the rotation speed of the exhaust fan 35 is increased or decreased from the current rotation speed based on the current air volume equivalent value, as in step S5 of fig. 4, and then the process returns to step S108.
On the other hand, when the CPU361 of the control unit 36 determines in step S110 that the air volume equivalent value is equal to or less than the lower limit exhaust air volume, the process proceeds to step S112, and in step S112, a signal is transmitted to the centralized controller 40.
Step S108 to step S112 are executed in parallel with step S103 to step S107.
In step 113, when receiving a signal from the control unit 36 that at least one of the supply air volume and the discharge air volume is equal to or less than the lower limit, the CPU401 of the centralized controller 40 instructs the control unit 41 of the outdoor unit 10 to stop the operation of the compressor 13.
In step S114, the CPU411 of the control unit 41 of the outdoor unit 10, which has received the instruction from the centralized controller 40, stops the operation of the compressor 13.
In step S115, the CPU401 of the centralized controller 40 instructs the control unit 52 of the remote controller 50 to display a warning on the display unit 51 of the remote controller 50.
In step S116, the CPU521 of the control unit 52 that has received the instruction from the centralized controller 40 causes the display unit 51 to display a warning.
The warning or alarm can be given by displaying a sentence indicating a decrease in ventilation air volume of the ventilator 30 on the display unit 51, or by flashing a phrase such as "decrease in ventilation air volume" or a symbol indicating the phrase. By giving an alarm on the display unit 51, it is possible to make it easy for a service person or a user to know that there is a defect in the ventilator 30 and that a normal ventilation air volume cannot be ensured. This can prompt the service person or the user to eliminate the defect of the ventilator 30. Further, by eliminating the failure of the ventilator 30, the ventilation air volume can be suppressed from being insufficient even when the refrigerant leaks.
As described above, the air-conditioning ventilation system S according to the present embodiment is the first ventilation device that performs air supply by the air supply fan and air discharge by the air discharge fan, and the "ventilation air volume" is the air supply air volume or the air discharge air volume. In contrast, in the case of the second type of ventilator in which air supply is performed by a fan and exhaust is natural exhaust, "ventilation air volume" is the supply air volume, and in the case of the third type of ventilator in which air supply is performed by a fan and exhaust is natural air supply, "ventilation air volume" is the exhaust air volume.
[ method for calculating lower limit intake air volume and lower limit exhaust air volume (first predetermined value) ]
The "lower limit supply air volume" and the "lower limit discharge air volume" can be selected based on various guidelines or the like defined for safety measures against leaked refrigerant. For example, IEC standard or GL-16(JRA) specifies the amount of ventilation required to safely prevent refrigerant leakage by ventilation. The "lower limit intake air volume" and the "lower limit exhaust air volume" may be set in the same manner or in different manners. Hereinafter, the "lower limit intake air volume" and the "lower limit exhaust air volume" are the same setting and are referred to as "first predetermined values".
In the present embodiment, the heat transfer efficiency is improved based on JRA GL-16, which is a guideline prescribed by the Japan Cooling and air Conditioning industry Association (JRA): 2017 to set the above-mentioned "first predetermined value". In the above-mentioned guideline, as a valuable safety measure against the refrigerant leakage, the ventilator is defined to have a ventilation capability equal to or more than the number of times of ventilation calculated by the following formula (1).
n≥50/(G×V)······(1)
Here, n is the number of ventilation times (times/h), G and V are LFL (kg/m), respectively3) And the volume (m) of the room3). LFL is a Lower Limit of combustion (Lower flexibility Limit) and refers to the minimum concentration of the refrigerant that can propagate a flame in a state where the refrigerant and air are uniformly mixed, which is specified by ISO 817. For example, in the case of R32 refrigerant, LFL is 0.307kg/m3。
The area and height of the room are 100m3And 3m, the volume V of the room is 300m3. When R32 is used as the refrigerant, the LFL of R32 is 0.307kg/m3Therefore, according to the formula (1), the required ventilation frequency n is 50/(0.307 × 300) or more, i.e., 0.543/h. Therefore, the required ventilation capacity (ventilation air volume) of the room is 0.543 times/h 300m3163m per time3More than h.
The "first predetermined value" can be, for example, a value equal to or greater than the required ventilation capacity (ventilation air volume) calculated by the above equation (1). When the value calculated in the above calculation example is taken as the first predetermined value, the first predetermined value is 163m3H is used as the reference value. Therefore, if the control unit 36 determines that at least one of the supply air volume of the ventilator 30 detected by the supply air volume detection unit 37 and the exhaust air volume of the ventilator 30 detected by the exhaust air volume detection unit 38 is 163m3When the pressure is lower than/h, the operation of the compressor 13 of the outdoor unit 10 is stopped. That is, the compressor 13 in the operating state stops its operation. In addition, the compressor 13 that is not in operation maintains its stopped state.
[ modification 1 ]
In the air conditioning and ventilation system S according to modification 1, an auxiliary fan 60 that assists the supply and discharge of air by the ventilation device 30 may be provided separately from the ventilation device 30. Fig. 6 is an explanatory diagram of a refrigerant piping system and an air system in a modification of the air-conditioning ventilation system S shown in fig. 1, which is provided with such an auxiliary fan 60. Fig. 7 is a block diagram showing the configuration of the centralized controller, the outdoor unit, the indoor unit, the ventilation device, the remote controller, and the respective control units of the auxiliary fan in the air conditioning and ventilation system shown in fig. 6. In fig. 6 and 7, the same reference numerals as those in fig. 1 and 2 are given to elements or structures common to those shown in fig. 1 and 2, respectively, and the description thereof will be omitted for the sake of simplicity.
The auxiliary fan 60 is a ventilation fan disposed separately from the ventilation device 30. The assist fan 60 includes an air supply assist fan 61, an air discharge assist fan 62, and a control unit 67. The auxiliary fan 60 and the room R are connected by a blowing duct 63 and a blowing duct 64. The air supply duct 63 is connected to an air supply duct 31 connecting the ventilation device 30 and the room R. The air supply duct 64 is connected to the return air duct 32 that connects the ventilator 30 and the room R. An electric damper 65 for opening and closing the air duct 63 is disposed in the air duct 63. An electric damper 66 for opening and closing the air duct 64 is disposed in the air duct 64. The control unit 67 controls the operations of the air supply auxiliary fan 61, the air discharge auxiliary fan 62, the electric damper 65, and the electric damper 66. As shown in fig. 7, the control unit 67 includes a CPU671, a storage unit 672, and a transmission/reception unit 673. The control unit 67 is communicably connected to the centralized controller 40 via the transmission/reception unit 673. The air supply ducts 63 and 64 can also be directly connected to the room R without being merged with the air supply duct 31 and the air return duct 32 of the ventilator 30.
[ operation of auxiliary fan 60 when the air volume of ventilator 30 is reduced ]
In the present modification, when the determinations in step S105 and step S110 in fig. 5 are negative, the following control can be performed, for example.
When the CPU361 of the control unit 36 determines in step S105 that the air volume equivalent value is higher than the lower limit supply air volume (no in step S105), it determines whether or not the air volume equivalent value is equal to or lower than the second predetermined value. The second predetermined value is a value larger than the lower limit supply air volume. If the CPU361 determines that the air volume equivalent value is equal to or less than the second predetermined value, it transmits a signal to the centralized controller 40. On the other hand, if the CPU361 determines that the air volume equivalent value is not equal to or less than the second predetermined value, it proceeds to step S106.
When it is determined in step S110 that the air volume equivalent value is higher than the lower limit exhaust air volume (no in step S110), it is determined whether or not the air volume equivalent value is equal to or lower than the second predetermined value. The second predetermined value is a value larger than the lower limit exhaust air volume. If the CPU361 determines that the air volume equivalent value is equal to or less than the second predetermined value, it transmits a signal to the centralized controller 40. On the other hand, if the CPU361 determines that the air volume equivalent value is not equal to or less than the second predetermined value, it proceeds to step S111.
When receiving a signal indicating that at least one of the supply air flow rate and the exhaust air flow rate is within the above-described range from the control unit 36, the CPU401 of the centralized controller 40 instructs the control unit 67 of the assist fan 60 to start operation. The control section 67 starts the operation of the assist fan 60. Specifically, since the assist fan 60 includes the air supply assist fan 61 and the air discharge assist fan 62, the control unit 67 operates both the air supply assist fan 61 and the air discharge assist fan 62. Before the auxiliary air supply fan 61 is operated, the electrically operated damper 65 for normally closing the air supply duct 63 is opened. The air from the auxiliary air supply fan 61 is supplied into the room R together with the supply air SA from the ventilation device 30. Before the exhaust auxiliary fan 62 is operated, the electric damper 66 for normally closing the air duct 64 is opened. The return air RA from the room R is distributed to the ventilator 30 and the auxiliary fan 60 and discharged to the outside.
After the start of the operation of the auxiliary fan 60, the CPU361 of the control unit 36 returns to step S106 and step S111. In the following processing, the supply air volume is a sum of the supply air volume of the ventilator 30 and the supply air volume of the supply auxiliary fan 61. The exhaust air volume is the sum of the exhaust air volume of the ventilator and the exhaust air volume of the auxiliary exhaust fan 62. The air volumes of the auxiliary air supply fan 61 and the auxiliary air discharge fan 62 can be determined by the same means as the air volume detection units 37 and 38 of the ventilator 30, and when an auxiliary fan with a constant air volume is used for simplifying the configuration, the constant air volume can be set to the preset air volume.
Then, in step S105, the CPU361 of the control unit 36 sends a signal to the centralized controller 40 when determining that the sum of the supply air volume of the ventilator 30 and the supply air volume of the supply auxiliary fan 61 is equal to or less than the lower limit supply air volume. In step S110, the CPU361 sends a signal to the centralized controller 40 when determining that the sum of the exhaust airflow rate of the ventilator 30 and the exhaust airflow rate of the auxiliary exhaust fan 62 is equal to or less than the lower limit exhaust airflow rate. Upon receiving a signal indicating that at least one of the supply air volume and the discharge air volume is equal to or less than the lower limit value, the CPU401 of the centralized controller 40 stops the operation of the compressor 13 and causes the display unit 51 to issue an alarm.
As described above, by operating the auxiliary fan 60, the reduced air volume of the ventilator 30 can be supplemented. Further, the CPU401 may start the operation of the auxiliary fan 60 and may cause the display unit 51 of the remote controller 50 to emit a warning alarm different from the above alarm. By issuing the advance warning, it is possible to make the serviceman or the user know the failure of the ventilation apparatus before the forced stop of the operating indoor unit 20 is reached and take a measure to eliminate the failure. As the advance warning, similar to the above-described warning, it is possible to display a word indicating that the reduction in the air volume of the ventilator 30 is approaching the danger zone, or to flash a phrase such as "ventilator air volume reduction attention" or a symbol indicating the phrase.
Further, when at least one of the supply air volume and the exhaust air volume cannot secure the lower limit value even by the air volume assist by the assist fan 60, the CPU401 stops the operation of the compressor 13 and causes the display unit 51 to issue an alarm. This makes it possible to make the service person or the user know that the normal ventilation air volume cannot be ensured, and to prompt the trouble elimination of the ventilator 30. Therefore, even if the refrigerant leaks, the shortage of the air volume of the ventilator 30 can be suppressed.
Here, the "second predetermined value" is a value larger than the "lower limit intake air volume" and the "lower limit exhaust air volume" ("first predetermined value"), and can be, for example, a value of 105 to 110% of the required ventilation capacity calculated by the equation (1). Specifically, when 105% of the value calculated in the above calculation example is set as the second predetermined value, the second predetermined value is 163 × 1.05 — 171.15m3H is the ratio of the total weight of the catalyst to the total weight of the catalyst. Therefore, when the control unit 36 determines that at least one of the supply air volume and the exhaust air volume is 171.15m 3/h or less, the operation of the assist fan 60 is started. In the above description, the "second predetermined value" of the intake air flow rate and the exhaust air flow rate is the same value, but may be different values.
[ modification 2 ]
In the air-conditioning ventilation system S of modification 2, in the control of fig. 5, at least one of the supply air volume and the exhaust air volume is equal to or less than the lower limit value, and before the operation of the air-conditioning apparatus a is brought into a stopped state, a "warning alarm" may be issued to make the serviceman or the user know that the ventilation air volume is reduced. The timing of issuing the advance warning may be the same as the timing of starting the operation of the auxiliary fan 60 in modification 1. That is, the CPU361 of the control unit 36 may determine that at least one of the supply air volume and the exhaust air volume of the ventilator 20 is greater than the first predetermined value (lower limit supply air volume, lower limit exhaust air volume) and equal to or less than the second predetermined value that is greater than the first predetermined value. The contents of the advance warning are the same as in modification 1.
By giving an advance warning on the display unit 51, the service person or the user can know that there is a defect in the ventilator 30 and the normal ventilation air volume cannot be ensured, and the air volume reduction approaches the dangerous area. By making the serviceman or the user aware of the failure of the ventilator 30 before the forced stop of the air conditioner during the operation is reached, the failure can be eliminated, and the inconvenience caused by the forced stop of the air conditioner can be avoided.
[ modification 3 ]
In the air conditioning and ventilating system S of modification 3, the supply air volume detecting unit 37 and the exhaust air volume detecting unit 38 may be sensors that measure the power consumption of each motor (not shown) that operates the supply fan 34 and the exhaust fan 35. When the power consumption amount sensor is used, the air volume equivalent value may be, for example, a power value corresponding to the power consumption amount. When the power consumption amount sensor is used as the intake air volume detection unit 37 and the exhaust air volume detection unit 38, the following data is stored in the storage unit 362 as the intake air target volume and the exhaust air target volume. Specifically, the storage unit 362 stores data in advance relating the rotation speed of the air supply motor at a plurality of stages for achieving the target air supply flow rate to the power value corresponding to the rotation speed. The storage unit 362 stores data in advance relating the rotation speed of the exhaust motor at a plurality of stages to achieve the target exhaust air flow rate to the power value corresponding to the rotation speed.
When the air volume of the ventilator 30 decreases, the process may be performed as follows. The control unit 36 obtains the power consumption of the air supply motor from the air supply air volume detection unit 37, and obtains the power consumption of the air exhaust motor from the air exhaust air volume detection unit 38. When the power consumption amount is smaller than the power value corresponding to the current rotation speed and exceeds the predetermined range, CPU361 of control unit 36 determines whether the power consumption amount is equal to or smaller than the lower limit value. If the rotation speed is not equal to or less than the lower limit value, the CPU361 increases the rotation speeds of the air supply fan 34 and the air discharge fan 35. If the value is equal to or less than the lower limit value, the air conditioning ventilation system S of the present modification performs the processing below step S107 and step S112 in fig. 5.
[ modification 4 ]
In the air-conditioning ventilation system S according to modification 4, if the CPU361 of the control unit 36 determines that at least one of the supply air volume and the discharge air volume is equal to or less than the lower limit value, the CPU401 of the centralized controller 40 may prohibit the operation of the indoor unit 20 by the remote controller 50. More specifically, if the CPU361 of the control unit 36 determines that at least one of the supply air volume and the discharge air volume is equal to or less than the lower limit value, the CPU401 of the centralized controller 40 prohibits the operation of the indoor unit 20 by the remote controller 50. This can prevent the user from operating the indoor unit 20 when the ventilation device 30 is defective and maintenance is necessary, for example. As a result, maintenance for eliminating the failure of the ventilator 30 can be more reliably promoted.
Further, when the release information is input, the CPU401 of the centralized controller 40 may allow the operation of the indoor unit 20 by the remote controller 50. The release information can be input to the remote controller 50 by, for example, a service person who confirms that the defect of the ventilator 30 has been eliminated switching the remote controller 50 to a maintenance mode in which only the service person can input and confirm the release information.
[ Effect of the disclosure ]
In the present disclosure, if it is determined that the air volume equivalent value of the ventilator 30 is equal to or less than the first predetermined value, the CPU401 of the centralized controller 40 sets the operation of the air conditioner a to a stopped state. This can suppress the shortage of the air volume of the ventilator 30 even when the refrigerant leaks. The operation of the air conditioner a is stopped when the operation of the compressor 13 of the outdoor unit 10 is stopped.
In the present disclosure, the CPU361 of the control unit 36 performs constant air volume control for adjusting the rotation speeds of the intake fan 34 and the exhaust fan 35 so that the intake air volume equivalent value and the exhaust air volume equivalent value approach the respective target air volumes. When the CPU361 of the control unit 36 determines that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is equal to or less than the first predetermined value during the air volume constant control period, the CPU401 of the centralized controller 40 sets the operation of the air conditioner a to a stopped state. This can suppress the shortage of the air volume of the ventilator 30 even when the refrigerant leaks. Further, the CPU401 of the centralized controller 40 sets the operation of the air conditioner a to a stop state, and causes the display unit 51 of the remote controller 50 to issue an alarm. The service person or the user can be made aware of the failure of the ventilation device and can take a measure to eliminate the failure.
In the present disclosure, when the CPU361 of the control unit 36 determines that at least one of the supply air volume equivalent value and the exhaust air volume equivalent value is greater than the first predetermined value and equal to or less than the second predetermined value that is greater than the first predetermined value, the CPU401 of the centralized controller 40 causes the display unit 51 of the remote controller 50 to issue an advance warning alarm. This makes it possible to make a serviceman or a user recognize a failure of the ventilator and take a measure to eliminate the failure before the forced stop of the air conditioner a during operation is reached.
In the present disclosure, if the CPU361 of the control unit 36 determines that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is equal to or less than the first predetermined value, the CPU401 of the centralized controller 40 prohibits the operation of the air conditioner a by the remote controller 50. This can prevent the user from operating the air conditioner a when maintenance is required due to a failure of the ventilator 30, for example, and as a result, more reliable prompt for maintenance to eliminate the failure of the ventilator 30 can be made.
In the present disclosure, when the CPU361 of the control unit 36 determines that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is equal to or less than the second predetermined value, which is greater than the first predetermined value and greater than the first predetermined value, the CPU401 of the integrated controller 40 operates the auxiliary fan 60. By operating the auxiliary fan 60, the reduced air volume of the ventilator 30 can be supplemented.
In the present disclosure, when the CPU361 of the control unit 36 determines that at least one of the sum of the supply air volume equivalent value and the supply air volume equivalent value of the auxiliary fan and the sum of the exhaust air volume equivalent value and the exhaust air volume equivalent value of the auxiliary fan is equal to or less than the first predetermined value, the CPU401 of the centralized controller 40 sets the operation of the air conditioner a to the stopped state. When at least one of the sum of the supply air volume equivalent value and the sum of the exhaust air volume equivalent value cannot ensure the first predetermined value even by the air volume assist by the assist fan 60, the operation of the air conditioner a is stopped, so that the serviceman or the user can know that the normal ventilation air volume cannot be ensured, and the failure of the ventilation device 30 can be eliminated. This can suppress the shortage of the air volume of the ventilator 30 even when the refrigerant leaks.
In the present disclosure, the supply air volume by the supply air fan 34 and the exhaust air volume by the exhaust air fan 35 are determined according to the rotation speed and the power consumption of the supply air fan 34 and the rotation speed and the power consumption of the exhaust air fan 35, respectively. Whether or not the air volume is equal to or less than the first predetermined value can be determined using the air volume determined from the rotation speed of the fan and the power consumption amount.
[ other modifications ]
The present disclosure is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.
For example, in the above-described embodiment, the number of outdoor units is 1, but 2 or more outdoor units may be employed, and the number and arrangement of the outdoor units, the indoor units, and the ventilation devices are not particularly limited in the present disclosure, and can be appropriately selected to configure the air conditioning and ventilation system.
In the above-described embodiment, when at least one of the supply air volume and the exhaust air volume is equal to or less than the lower limit, the CPU401 of the centralized controller 40 sets the operation of the air conditioner a to the stopped state. When both the supply air volume and the exhaust air volume are equal to or less than the lower limit, the CPU401 may stop the operation of the air conditioner a. The same applies to modification 1 in which the auxiliary fan 60 is provided.
In the above-described embodiment, the supply air volume and the exhaust air volume are determined from the power consumption and the rotation speed of the air volume sensor or the motors of the supply fan and the exhaust fan, but the present disclosure is not limited thereto, and the ventilation air volume may be determined by other methods. For example, the cross-sectional area of a duct for supplying or discharging air and the wind speed of wind flowing through the duct may be detected by a sensor, and the ventilation air volume may be determined from the detected wind speed and cross-sectional area. Further, the air may be passed through a nozzle whose cross-sectional area is known in advance, and the amount of air flowing through the nozzle may be determined based on the pressure difference (pressure drop) between the inlet and the outlet of the nozzle.
In the above-described embodiment, the orthogonal total heat exchanger is disposed in the ventilator, but a rotary total heat exchanger that recovers heat from the return air by rotation of the rotor may be employed. In addition, the total heat exchanger may be omitted from the ventilator.
In the above-described embodiment, the auxiliary fan 60 includes the auxiliary fan for air supply for supplying air into the room and the auxiliary fan for air discharge for discharging air from the room, but instead, only the auxiliary fan for air supply for supplying air into the room may be provided, or only the auxiliary fan for air discharge for discharging air from the room may be provided.
In the above-described embodiment, the display unit of the remote controller functions as an alarm unit and an alarm is issued by text information, symbols, or the like, but an audible alarm or both an audible alarm and an audible alarm may be used in addition to or instead of the visual alarm.
Description of the symbols
10: an outdoor unit;
11: a liquid refrigerant pipe;
12: a gas refrigerant pipe;
13: a compressor;
14: a four-way switching valve;
15: an outdoor heat exchanger;
16: an outdoor expansion valve;
17: a liquid stop valve;
18: a gas shutoff valve;
19: an outdoor fan;
20: an indoor unit;
21: an indoor expansion valve;
22: an indoor heat exchanger;
23: an indoor fan;
24: a refrigerant sensor;
25: a control unit;
30: a ventilation device;
31: a gas supply duct;
32: a return air duct;
33: a total heat exchanger;
34: an air supply fan;
35: an exhaust fan;
36: a control unit;
37: an air supply volume detection unit;
38: an exhaust air volume detection unit;
40: a centralized controller;
50: a remote controller;
51: a display unit;
52: a control unit;
53: an input section;
60: an auxiliary fan;
61: an auxiliary fan for supplying air;
62: an auxiliary fan for exhaust;
63: an air supply duct;
64: an air supply duct;
65: an electric damper;
66: an electric damper;
67: a control unit;
251：CPU；
252: a storage unit;
253: a transmitting/receiving unit;
361：CPU；
362: a storage unit;
363: a transmitting/receiving unit;
401：CPU；
402: a storage unit;
403: a transmitting/receiving unit;
411：CPU；
412: a storage unit;
413: a transmitting/receiving unit;
521：CPU；
522: a storage unit;
523: a transmitting/receiving unit;
671：CPU；
672: a storage unit;
673: a transmitting/receiving unit;
a: an air conditioning device;
r: indoor (conditioned space).

Claims (8)

1. An air conditioning ventilation system (S) is characterized by comprising:
an air conditioning device (A) having a heat exchanger (22) that generates conditioned air by heat exchange with a refrigerant;
a ventilation device (30) which is communicably connected to the air conditioning device (A) and has an air supply fan (34) and/or an exhaust fan (35);
air volume detection units (37, 38) for detecting an air volume equivalent value of the ventilator (30); and
a control part (36),
the control unit (36) stops the operation of the air conditioner (A) when determining that the air volume equivalent value acquired from the air volume detection units (37, 38) is equal to or less than a first predetermined value.
2. Air conditioning ventilation system (S) according to claim 1,
the ventilation device (30) is provided with an air supply fan (34) and an air exhaust fan (35),
the air volume detection units (37, 38) include: a supply air volume detection unit (37) that detects the supply air volume equivalent value of the supply air fan (34); an exhaust air volume detection unit (38) that detects an exhaust air volume equivalent value of the exhaust fan (35),
and a control unit (36) that performs air volume constant control for adjusting the rotation speed of the air supply fan (34) and the exhaust fan (35) so that the air supply air volume equivalent value and the exhaust air volume equivalent value approach respective target air volumes, and that, during air volume constant control, causes the operation of the air conditioner (A) to be in a stopped state when it is determined that at least one of the air supply air volume equivalent value and the exhaust air volume equivalent value is equal to or less than the first predetermined value.
3. Air conditioning ventilation system (S) according to claim 2,
an alarm unit (51) for generating an alarm based on the detected air volume equivalent value by the alarm unit (51),
the control unit (36) causes the alarm unit (51) to issue an alarm when it is determined that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is greater than the first predetermined value and is equal to or less than a second predetermined value that is greater than the first predetermined value.
4. Air conditioning ventilation system (S) according to claim 1,
the air conditioning ventilation system (S) further comprises a remote controller (50) for operating the operation of the air conditioning device (A),
the control unit (36) prohibits the operation of the remote controller (50) when determining that the air volume equivalent value acquired from the air volume detection unit (37) is equal to or less than a first predetermined value.
5. Air conditioning ventilation system (S) according to claim 2 or 3,
the air conditioning ventilation system (S) further comprises a remote controller (50) for operating the operation of the air conditioning device (A),
the control unit (36) prohibits the operation of the remote controller (50) when determining that at least one of the supply air volume equivalent value and the exhaust air volume equivalent value is equal to or less than a first predetermined value.
6. Air conditioning ventilation system (S) according to claim 3 or 5,
the air conditioning ventilation system (S) is also provided with an auxiliary fan (40) for supplementing ventilation air volume,
the control unit (36) operates the auxiliary fan (40) when determining that at least one of the intake air volume equivalent value and the exhaust air volume equivalent value is greater than a first predetermined value and is equal to or less than a second predetermined value that is greater than the first predetermined value.
7. Air conditioning ventilation system (S) according to claim 6,
the control unit (36) stops the operation of the air conditioner (A) when determining that at least one of the sum of the supply air volume equivalent value and the auxiliary fan supply air volume equivalent value and the sum of the exhaust air volume equivalent value and the auxiliary fan exhaust air volume equivalent value is equal to or less than the first predetermined value.
8. Air conditioning ventilation system (S) according to any of claims 2, 3, 5, 6 and 7,
the supply air volume of the supply air fan (34) and the exhaust air volume of the exhaust air fan (35) are determined according to the rotational speed and the power consumption of the supply air fan (34) and the rotational speed and the power consumption of the exhaust air fan (35), respectively.
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